package com.ruoyi.common.utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.*;

public class RSAEncryption {
    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥
    private static String privateKey = "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";
    public static void main(String[] args) throws Exception {
        genKeyPair();
        String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCm2xNZCUpPdhDMa0j/QHSKh6BhpYvpJpUuvG44j54vFLcKTPPHTrOuye841JrtqTHjzFxuuH4I3czLhSvRnc8MRMFRWBoIDh2lalT+S+fexO3LiJDwDKR8vKZy5fBhbHUVGRH3JLw+0KRP+KCD3LwsaHJBg7ymhmY/WxPmIHveYwIDAQAB";
        //测试
        String str = "{\"phoneNumber\":\"159753132849\",\"customerName\":\"hmc\",\"age\":20,\"sex\":1,\"city\":\"深圳\",\"creditLimit\":200000,\"channel\":\"hmc\",\"hasHouse\":1,\"hasCar\":1,\"hasCredit\":1,\"hasPolicy\":1,\"hasSocial\":1,\"hasAccumulationFund\":1}";
        String a = encrypt(str,publicKey);
        System.out.println(a);
        String b = decrypt(a);
        System.out.println(b);
    }



    /**
     * 随机生成密钥对
     * @throws NoSuchAlgorithmException
     */
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
        // 得到私钥字符串
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
        // 将公钥和私钥保存到Map
        keyMap.put(0,publicKeyString);  //0表示公钥
        keyMap.put(1,privateKeyString);  //1表示私钥

        System.out.println(publicKeyString);
        System.out.println("---------------------------------------------------------------------------");
        System.out.println(privateKeyString);
        System.out.println("---------------------------------------------------------------------------");

    }
    /**
     * RSA公钥加密
     *
     * @param str
     *            加密字符串
     * @param publicKey
     *            公钥
     * @return 密文
     * @throws Exception
     *             加密过程中的异常信息
     */
    public static String encrypt( String str, String publicKey ) throws Exception{
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }

    /**
     * RSA私钥解密
     *
     * @param str
     *            加密字符串
     *            私钥
     * @return 铭文
     * @throws Exception
     *             解密过程中的异常信息
     */
    public static String decrypt(String str) throws Exception{
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }


}